DD's radio aroma... yes, radio aroma

We’ve all experienced the nasty smells and stuffy air of
public transportation; but we deal. Wouldn't morning bus rides be more amiable if
we could replace the bus odor with the fresh aroma of coffee!

Amongst a growing coffee industry, the competition between
cafés is tough. Dunkin’ Donuts
wanted to break away from their reputation as a donut shop and become known as
a dominant coffee provider. To do so, they created a machine that recognized
their own tune and when heard released the smell of coffee. The released
aroma coincided with radio advertisements and placement of passenger drop
off. The result, increased sales and people now think of Dunkin’ Donuts for
morning coffee.